Watch The Big Bang Theory Season 5 Episode 18 online via TV Fanatic with over 7 options to watch the The Big Bang Theory S5E18 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Xfinity, and TBS.
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Sheldon's barber gets sick this week, while astronaut training causes Wolowitz to rethink his decision to head into space.